Abstract
IT is well known that when a cubic crystal of sodium chloride structure is stressed the refractive index changes and is different in different directions. Mueller1 pointed out that the observed difference between the refractive indices for mutually perpendicular directions—that is, along the direction of stress and a direction perpendicular to it—is always smaller in magnitude, and for some crystals even different in sign, than the calculated one. He explained this discrepancy by assuming that the polarizability of an ion changes with the application of stress. If a hydrostatic pressure is applied, the change in the polarizability is represented by the strain polarizability constant λ0. From the data then available Mueller assumed that λ0 is constant for all the crystals.
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BANSIGIR, K. Strain Polarizability Constant: a Measure of Ion Overlap in Crystals of Sodium Chloride Structure. Nature 216, 256–257 (1967). https://doi.org/10.1038/216256a0
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DOI: https://doi.org/10.1038/216256a0
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